C# Class Accord.Neuro.Learning.BackPropagationLearning

Back propagation learning algorithm.

The class implements back propagation learning algorithm, which is widely used for training multi-layer neural networks with continuous activation functions.

Sample usage (training network to calculate XOR function):

 // initialize input and output values double[][] input = new double[4][] { new double[] {0, 0}, new double[] {0, 1}, new double[] {1, 0}, new double[] {1, 1} }; double[][] output = new double[4][] { new double[] {0}, new double[] {1}, new double[] {1}, new double[] {0} }; // create neural network ActivationNetwork   network = new ActivationNetwork( SigmoidFunction( 2 ), 2, // two inputs in the network 2, // two neurons in the first layer 1 ); // one neuron in the second layer // create teacher BackPropagationLearning teacher = new BackPropagationLearning( network ); // loop while ( !needToStop ) { // run epoch of learning procedure double error = teacher.RunEpoch( input, output ); // check error value to see if we need to stop // ... }

Inheritance: ISupervisedLearning

Afficher le fichier Open project: accord-net/framework Class Usage Examples

Méthodes publiques

Méthode	Description
BackPropagationLearning ( ActivationNetwork network ) : System	Initializes a new instance of the BackPropagationLearning class.
Run ( double input, double output ) : double	Runs learning iteration. Runs one learning iteration and updates neuron's weights.
RunEpoch ( double input, double output ) : double	Runs learning epoch. The method runs one learning epoch, by calling Run method for each vector provided in the input array.

Private Methods

Méthode	Description
CalculateError ( double desiredOutput ) : double	Calculates error values for all neurons of the network.
CalculateUpdates ( double input ) : void	Calculate weights updates.
UpdateNetwork ( ) : void	Update network's weights.

Method Details

BackPropagationLearning() public méthode

Initializes a new instance of the BackPropagationLearning class.

public BackPropagationLearning ( ActivationNetwork network ) : System
network	ActivationNetwork	Network to teach.
Résultat	System

Run() public méthode

Runs learning iteration.

Runs one learning iteration and updates neuron's weights.

public Run ( double input, double output ) : double
input	double	Input vector.
output	double	Desired output vector.
Résultat	double

RunEpoch() public méthode

Runs learning epoch.

The method runs one learning epoch, by calling Run method for each vector provided in the input array.

public RunEpoch ( double input, double output ) : double
input	double	Array of input vectors.
output	double	Array of output vectors.
Résultat	double